16-Bit 570 kSPS CMOS Successive Approximation PulSAR® ADC with No Missing Codes

The AD7664 is a 16-bit, 570 kSPS, charge redistribution SAR, analog-to-digital converter that operates from a single 5 V power supply. The part contains a high speed 16-bit sampling ADC, an internal conversion clock, error correction circuits, and both serial and parallel system interface ports.

The AD7664 is hardware factory-calibrated and is comprehensively tested to ensure such ac parameters as signal-to-noise ratio (SNR) and total harmonic distortion (THD), in addition to the more traditional dc parameters of gain, offset, and linearity.

It features a very high sampling rate mode (Warp), a fast mode (Normal) for asynchronous conversion rate applications, and for low power applications, a reduced power mode (Impulse) where the power is scaled with the throughput.

It is fabricated using Analog Devices’ high performance, 0.6 micron CMOS process, with correspondingly low cost and is available in a 48-lead LQFP and a tiny 48-lead LFCSP with operation specified from –40°C to +85°C.

PRODUCT HIGHLIGHTS

* Fast Throughput

The AD7664 is a 570 kSPS, charge redistribution, 16-bit

SAR ADC with internal error correction circuitry.

* Superior INL

The AD7664 has a maximum integral nonlinearity of 2.5 LSBs

with no missing 16-bit code.

* Single-Supply Operation

The AD7664 operates from a single 5 V supply and dissipates

only a maximum of 115 mW. In Impulse Mode, its power

dissipation decreases with the throughput to, for instance, only

21 µW at a 100 SPS throughput. It consumes 7 µW maximum

when in power-down.

* Serial or Parallel Interface

Versatile parallel or 2-wire serial interface arrangement

compatible with both 3 V or 5 V logic.

APPLICATIONS

* Data acquisition

* Instrumentation

* Digital signal processing

* Spectrum analysis

* Medical instruments

* Battery-powered systems

* Process control

* Throughput:

570 kSPS (Warp mode)

500 kSPS (Normal mode)

444 kSPS (Impulse mode)

* INL: 2.5 LSB max (0.0038% of full scale)

* 16-Bit resolution with no missing codes

* S/(N+D): 90 dB Typ @ 45 kHz